Associations
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Foodplant / internal feeder
larva of Delia radicum feeds within live root of Brassica oleracea var. capitata
Foodplant / internal feeder
larva of Delia radicum feeds within live root of Brassica oleracea var. botrytis
Foodplant / internal feeder
larva of Delia radicum feeds within live sprout of Brassica oleracea var. gemmifera
Foodplant / internal feeder
larva of Delia radicum feeds within live root of Brassica rapa
Foodplant / internal feeder
larva of Delia radicum feeds within live root of Brassica oleracea var. italica
Foodplant / internal feeder
larva of Delia radicum feeds within live root of Raphanus sativus
Foodplant / internal feeder
larva of Delia radicum feeds within live root of Erysimum cheiri
Foodplant / internal feeder
larva of Delia radicum feeds within live root of Lobularia maritima
Foodplant / internal feeder
larva of Delia radicum feeds within live root of Matthiola
Animal / predator
larva of Phaonia trimaculata is predator of larva of Delia radicum
Animal / parasitoid / endoparasitoid
larva of Trybliographa rapae is endoparasitoid of larva of Delia radicum
Conservation Status
provided by University of Alberta Museums
Not of concern.
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Cyclicity
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Appears to be one to two generation a year in Alberta with emergence from overwintered puparia spread from mid May to mid July.
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Distribution
provided by University of Alberta Museums
Holarctic. Delia radicum can be found through out Canada, where cultivation of cruciferous crops is undertaken.
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General Description
provided by University of Alberta Museums
Delia radicum may be distinguished from other Delia species occurring in the field by the following combinations of characters: Adults look similar to house flies but are smaller (5mm), dark ash grey color with a dark stripe along the top of the abdomen, and covered with black hairs and bristles (setae).The reddish purple eyes on males nearly touch in the centre of the head while female eyes are separated. In males, the presence of the basal brush of long setae (anteroventral setae) on the hind femur and by relatively shorter lateral setae of the 5th sternite processes. In females, in the hind femur, the row of anteroventral setae is normally uneven and posteroventral setae are lacking.
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Habitat
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It is a major pest of Cruciferae crops and it is confined to gardens and cultivated lands.
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Life Cycle
provided by University of Alberta Museums
Adults are found from late spring to late October flying close to the ground in search of suitable host plants. Flies emerge in the spring from overwintering puparia and feed on the nectar of wild flowers. They mate and females begin egg laying about a week after emerging. During their 5-6 week life span, females lay eggs singly or in masses at or near the stems of host plants on cool, moist soil. Depending on temperature, maggots hatch in 3-10days and commence feeding on small roots and root hairs and then tunnel in to the main roots. They mature in about 3-4weeks, then leave the roots and pupate in puparia about 5-20cm deep in the soil. Adult flies emerge in 2-3 weeks, mate, lay eggs, and repeat the cycle
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Trophic Strategy
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Larvae are notorious root maggots infesting all forms of cultivated cruciferous crops. The larvae can also be found on certain cruciferous weeds among which stink weed (Thlaspi arvense L.) is particularly important in Alberta as cited by Griffiths( 1986).
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Delia radicum
provided by wikipedia EN
Delia radicum, known variously as the cabbage fly, cabbage root fly, root fly or turnip fly, is a pest of crops.[3] The larvae of the cabbage root fly are sometimes known as the cabbage maggot or root maggot. The adult flies are about 1 cm long and are grey in colour, but otherwise resemble the common house fly.[4]
The flies can be found all over Europe. After overwintering as pupae in the soil, the flies emerge in spring, feed on nectar, and lay eggs close to plants of the genus Brassica. The eggs are white and about 1 mm in diameter. They hatch into white maggots after about six days and the larvae feed for about three weeks on the roots and stems of the cabbage plants. After this, the larvae are typically 0.9 to 1 cm in length and form reddish-brown pupae which hatch into adult flies after around 20 days. This species is univoltine (has one generation per year) in northern Europe and bi- or trivoltine in central Europe.[5]
Economic significance
The first sign of the presence of the larvae is a delay in plant growth accompanied by the withering of leaves which develop a bluish tinge. The larvae are found on cabbage, turnip, swede, radish, and other cruciferous crops. Sometimes, 300 larvae can be found on one plant, damaging the inner parts of the main root and disrupting the transport of water and nutrients to the stem and leaves causing the death of many plants.[5]
References
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Delia radicum: Brief Summary
provided by wikipedia EN
Delia radicum, known variously as the cabbage fly, cabbage root fly, root fly or turnip fly, is a pest of crops. The larvae of the cabbage root fly are sometimes known as the cabbage maggot or root maggot. The adult flies are about 1 cm long and are grey in colour, but otherwise resemble the common house fly.
The flies can be found all over Europe. After overwintering as pupae in the soil, the flies emerge in spring, feed on nectar, and lay eggs close to plants of the genus Brassica. The eggs are white and about 1 mm in diameter. They hatch into white maggots after about six days and the larvae feed for about three weeks on the roots and stems of the cabbage plants. After this, the larvae are typically 0.9 to 1 cm in length and form reddish-brown pupae which hatch into adult flies after around 20 days. This species is univoltine (has one generation per year) in northern Europe and bi- or trivoltine in central Europe.
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